Re: [ubl] Global vs. Local -- Gunther's Recommendation

One more comment that I meant to put in my last message.  If someone is
building a new customization based on the UBL library, and they want to specify
a new *role* for an existing type without changing the type definition, then a
local element declaration should be used.

For example, within AcmeOrder specialization:

<xs:element name="DropShipAddress" type="cat:AddressType" />

This declares a new element within Order and reuses an existing type, but not
an existing element.